Final answer:
High-frequency signals can travel longest distances with direct communication due to their high information-carrying capacity.
Explanation:
High-frequency signals can travel the longest distance with a direct line of communication due to their ability to carry more information per unit time. For example, microwaves, which are high-frequency signals, are suitable for long-distance transmissions like satellite communication.
Low-frequency signals, on the other hand, have limited bandwidth and cannot carry as much information per unit time as high-frequency signals, making them less efficient for long-distance communication.
Medium-frequency signals fall between low and high frequencies in terms of bandwidth and communication capabilities.
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